Boiler scaling tool



March 27, 1951 B. E. MILLS BOILER SCALING TOOL Filed om. 29, 1947 Mi/25% m ATTONEK Patented Mar. 27, 1951 UNITED STATES yPATEN'I OFFICE Blair E. Mills, Lowellville, Ohio Application october 29, 1947, seriarNo. 782,770

ticularly to tools adapted for use in removing scale from a boiler.

The principal object of the invention is the provision of a set of scale removing tools.

A further object of the invention is the provision of a set of scale removing tools adapted for use with a pneumatic reciprocating tool.

A still further object of the invention is the provision of a scale removing tool having a plurality of cutters arranged in parallel relation to one another.

A still further object of the invention is the provision of a scale removing tool having an arcuate face and a plurality of cutters positioned in parallel yrelation to one another thereon.

A still further object of the invention is the provision of a scale removing tool having a plurality of radially spaced inclined cutters for selective registry with rounded objects such as rivets and the like.

A still further object of the invention is the provision of a scale removing tool having a plurality of interchangeable cutter carrying heads for registry with various straight and curved surfaces of a boiler from which the scale is to be removed.

'Ihe scale removing tools shown and described herein make possible the rapid and efficient removal of scale from boiler surfaces particularly when used in connection with a pneumatic gun for imparting rapid reciprocating movement to the scale removing tools. 'I'he formation of scale in boilers has long been recognized as a factor increasing the cost of operation of the boiler as the scale forms an insulating wall seriously affecting heat conduction and at the same time blocking the various fluid passageways in the boiler. It has therefore long been recognized that periodic removal of the scale from the boiler is essential. In the past such removal of scale has generally been accomplished by the use of a chipping hammer which necessitated a slow and costly scale removing operation.

The present invention relates to scale removlng tools which are adapted to be used with pneumatic guns or electric reciprocating guns and each of the tools will remove a relatively Wide area of scale from a boiler wall surface in a very short time by reason of the formation of a plurality of spaced cutters comprising the scale engaging surfaces of the tools. The tools are arranged so that alternate heads may be used thereby enabling the operator to choose the type of head matching the contour of the boiler wall being cleaned.

1 Claim. (ci. zii- 81) With the foregoing and other objects in View which will appear as the description proceeds, the invention resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed, it being understood that changes in the precise embodiment of the invention herein disclosed can be made within the scope of what is claimed Without departing from the spirit of the invention.

The invention is illustrated in the accompanying drawing, wherein:

Figure 1 is a side elevation of a scale removing tool with parts broken away and parts in cross section.

Figure 2 is an end elevation of the scale removing tool shown in Figure 1 and taken on line 2-2 thereof.

Figure 3 is a side elevation of a modied form of scale removing tool.

Figure 4 is an end elevation of a further modified form of a scale removing tool.

Figure 5 is a side elevation of the scale removing tool illustrated in Figure 4 with parts broken away and parts in cross section as taken on line 5-5 of Figure 4.

By referring to the drawings and Figures 1 and 2 in particular it will be seen that a scale removing tool has been disclosed which comprises a shaft I0 having an area I I of reduced diameter near one end thereof and forming means by which the shaft I0 may be engaged by a reciprocating tool such as a pneumatic gun. The other end of the shaft ID is threaded, as indicated by the numeral I2, and is provided with a lock nut I3. A scale removing head la is threadably engaged upon the threaded end I2 of the shaft Iii as it is provided with a drilled and tapped socket I5 for such engagement. The face of the head I4 is provided with a plurality of transversely positioned spaced cutters Iii, as best shown in Figure 2 of the drawings. It will thus be seen that when the head I4 is assembled on the threaded end I2 of the shaft I0 and a lock nut I3 tightened thereagainst, the shaft I0 and head I4 become a unit which, may be installed in a reciprocating tool such as `a pneumatic gun and the same effectively used in removing scale from the inner surface ofla boiler and the like.

The provision of the plurality of parallel cutters I6 spaced with respect to one another results in the simultaneous removal of scale from a relatively Wide area of the boiler as each of the cutters I6 act as a chipping hammer and, in cooperation with the adjacent cutters I6, rapidly cuts away scale from the boiler wall surface.

t will be obvious to those skilled in the art that many boiler surfaces are curved or rounded and a modified form of the scale removing head of the tool has been provided for placement on the end of the shaft I0 for cleaning such rounded or curved boiler surfaces. In Figure 3 of the drawings a side elevation of the modified form of the head is disclosed and the same is indicated therein by the numeral I1. The scale engaging surface thereof is formed in an arc i8 and the arcuate surface I8 has a plurality of cutters I9 formed transversely thereof in spaced relation to one another. A drilled and tapped socket 20 enables the threaded end AIl! of the shaft l0 to be engaged in the arcuate shaped head I1.

It will thus be seen that a simple and elficient scale removing tool has been disclosed which lar head, the said head having an outwardly bowed front surface, a plurality of sharp ridges CII 4 formed integrally in said outwardly bowed front surface at right angles to the plane of the said arc.

BLAIR E. MILLS.

REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS Number Name Date 521,695 Armstrong June 19, 1894 761,153 Durkee May 31, 1904 848,459 Grant Marr. 26, 1907 949,513 Zein Feb. 15, 1910 1,645,317 Carrol Oct; 11, 1927 1,727,915 Thomson Septi 1Q, 1929 1,913,267 Deyo June 6, 1933 2,099,677 Cunningham Nov. 23, 1937 2,136,595 Rogers Nov. 15, 1938 2,335,150 Johnson 1a-dage Noya 23, 1943 2,427,417 Priokett -'.Y-t-e; Sept, 116, 1947 FOREIGN PATENTS Number Country @ate 753,705 France Aug. 12, 19,33 

